Le, Hung Xuan
Truong, Dung Thi Thuy
Tran, Long Bao
Le, Phuoc Hong
Pham, Binh Uyen Duong
Wada, Koji
Ikeda, Shunya
Garidkhuu, Ariuntuul
Van Phan, Can
Le, Ngoan Tran
Article History
Received: 8 February 2022
Accepted: 8 July 2022
First Online: 21 July 2022
Declarations
:
: The authors confirm to follow the study protocol that was approved by the Ethics Committee of IRB-Hanoi Medical University, Vietnam for ethics in biomedical research implementation (Approval number NCS33/HMU-IRB dated 29 March 2019), and the IRB-International University of Health and Welfare, Japan (Approval number 21-Ig-92 dated on 21 August 2021). The study is performed without intervention that is a secondary analysis using existing data. We used the method of anonymous. Data is saved into a USB and private computer hard disk with a password. USB and computer are kept secured with the principal investigator and will not allow other people to go through except research team members. The data will be saved for 10 years after publication.All methods were performed and carried out following relevant ethical guidelines and Vietnam's national regulations. We obtained verbal informed consent from 12,212 households and their family members of 49,975 persons before conducting an interview using the designed baseline survey questionnaire in 2008. All answers about smoking habits, diet-related factors, and family history will be anonymous by numbers. According to the guideline for epidemiological study in Vietnam and Japan in 2002, written informed consent was not required for observational study based on a questionnaire survey. Completion and return of the questionnaire were considered implied consent.
: Not applicable.
: The authors declare that they have no competing interests.